Poster panel



Dec. 15, 1964 Filed March 29. 1961 R. L. CARLETON POSTER PANEL 3 Sheets-Sheet 1 INVENTOR.

flea/W4 4. a /ef0/7 OIQNEY- R. L. CARLETON POSTER PANEL Dec. 15, 1964 3 Sheets-Sheet 2 Filed March 29, 1961 INVENTOR. F/c/mfld L. flan/afar Dec. 15, 1964 R. L. CARLETON 3,160,974

POSTER PANEL Filed March 29, 1961 3 Sheets-Sheet 3 4 INVENTOR. 2.9a P/o/mrd L. C'ar/e/w;

,4 ORNEK United States Patent 3,160,974 POSTER PANEL Richard L Carleton, Raytown, l t lo assignor to Butler Manufacturing Company, a corporation of Missouri Filed Mar. 29, 1961, Ser. No. 99,201 '7 illaims. (Cl. d-tl--l25) This invention relates in general to outdoor signs and refers more particularly to the construction of relatively smaller size sign boards of the type used along the roadside for advertising or display purposes. It additionally relates to signs mountable upon the outside walls of buildings, side walls of trucks, and the like.

This invention is an improvement over that disclosed in Patent No. 2,901,849, R. P. Callison, issued September 1, 1959, for Advertising Panel.

An object of the invention is to provide a sign board construction made up of prefabricated components which can be assembled speedily and easily at the desired site whereby erection of the sign can be accomplished with a minimum amount of time and labor and the cost of installation thus reduced.

An important feature of the invention resides in the provision of a sign construction assembly wherein the panel components can be assembled into the sign and on the frame thereof working from the front side of the sign only. This has particular advantage where signs are placed back-to-back, or mounted on the wall of a building.

Another object of the invention is to provide a sign board which, after erection, can be dismantled or disassembled with equal ease and speed and without damage to the components thereof, whereby the parts can he reused successively at different locations in the event the initial site is abandoned for any reason.

A further object of the invention is to provide a sign board of the foregoing character which is neat and attractive in appearance, which is sturdy and rugged in construction, which is not subject to weathering and requires relatively little maintenance, and whose components are economically manufacturable.

Still another object of the invention is to provide a sign board whose display area is composed of a plurality of separate panel sections disposed horizontally edge-toedge in such positively registering relationship that the display matter or advertising may be imposed on the panels before erection of the sign with assurance that, when the panels thereafter are assembled at the site, there Will be no mismatching of the display material at the meeting lines of adjacent panels. In the case of painted signs, for example, this makes it unnecessary for the sign artists to work onopen outdoor scaffolding at the site where conditions are not favorable to rapid work and their painting is subject to interruption due to unfavorable weather; instead, they can prepaint the individual panels at a central headquarters, protect it from the weather and under ideal working conditions, leaving for less skilled artisans the simple task of assembling the panels at the desired site.

An additional object is to provide a sign board structure upon which posters may be pasted, the display area being framed by an attractive molding or border trim.

A feature of the invention resides in the use of panels supported on vertical stringers which are easily mounted on vertical posts or other vertical supports.

Another feature of the invention is the provision of a sign assembly in which the number of vertically extending support members for the panels can be increasd with ease and facility to any desirable number to allow for increased wind loads on the panel face by adding brace members to the horizontal panel members or, alternatively, wherein only two vertical support members may.

be employed to provide a safe, stable support for the sign assembly.

Another object of the invention is to provide a sign assembly made up of a plurality of individual horizontally oriented elongate panels, each said panel having a plurality of vertically extending panel stilfeners readily engageable and disengageable therewith whereby to aid in the shape retention and strengthening of the panels and extremely simple yet strong and positive acting mounting means cooperating between the vertical panel stiffeners and vertical stringers also of simple construction, the latter being readily mountable on posts or other vertical supports.

Yetanother object of the'invention is to provide a Another object of the invention is to provide a mold ing for a panel system and a sign structure which is not bolted directly to the panels themselves, does not require the usual mounting hardware, but instead envelops the panel face, receiving the necessary support from the panel sections, whereby to provide greatly enhanced ease, quickness and cheapness of installation.

Another object of the invention is to provide a sign construction employing a plurality of elongate horizontally extending panel members mounted on vertically extending support means, wherein only a single pair of vertical support means need be employed to carry the entire weight of and support the panel system completely, the support means having integral therewith means for engaging and supporting individual panels of the set.

Another object of the invention is to provide a sign construction including and employing elongate horizontally extending panel members, the panel members braced by stiifeners on the back side thereof, the stiifeners carrying the engagement means to mount the panel members on vertically oriented support means, the sign panel members so interengaging and self-supporting as to require a minimum number of stiffening members.

Other and further objects of the invention will appear in the course of the following description thereof.

in the drawings, which form a part of the instant spec- I ification and are to be read in conjunction therewith, embodiments of the invention are shown and, in the various views, like numerals are employed to indicate like parts.

FIG. 1 is a front elevation of a sign board structure or advertising panel embodying the invention, parts being cut away for purposes of better illustrating the inventive structure.

FIG. 2 is an enlarged rear elevation of the sign board structure or advertising panel of FIG. 1, a portion thereof cut away for purposes of illustration to show the relationship of the trim to the assembled panel system.

FIG. 3 is an enlarged rear perspective from the left side of FIG. 2 and at the lower end of the panel assembly detailing the interengagement of the hook members on the panel stiffeners with the vertical stringers.

FIG. 4 is a view taken along the line 4-4 of FIG. 3 in the direction of the arrows.

FIG. 5 is a detail of an individual panel stiffener free of the panel taken from the angle of FlG.' 3.

FIG. 6 is an enlarged detail of a portion of a vertical from the view of FIG. 3.

Patented Dec. is, was

FIG. 7 is a view taken along the line 7-7 of FIG. 2 in the direction of the arrows.

FIG. 8 is a side view of a second type of vertical stringer or support.

FIG. 9 is a front view of the vertical support of FIG. 8.

FIG. 10 is a view taken along the line 1010 of FIG. 9 in the direction of the arrows.

FIGS. 1-7, inclusive, show the inventive panel construction mounted on Z-bar stringers. The Z-bar stringer means of these figures will be first described. FIGS. 8-10, inclusive, show alternative means in the form of channel posts adapted to mount the panels of the subject sign construction. This will be described thereafter.

FIGS. 2, 3 and 6 show views of the Z-bar stringer from the rear with FIG. 4 showing it in cross section. The Z-bar stringer has a rear face or flange 2G with openings or slots 21 therein at the upper and lower ends thereof for installation of the stringer on vertical posts, building walls, vehicle side walls, or the like. Conventional bolts or screws may be inserted through the slots to engage the stringers with the vertical mounting means. Normal to rear flange there extends intermediate flange 22 which may be of any desired length whereby to space front flange 23 outwardly from the rear flange 20. Front flange 23 extends substantially parallel to rear flange 20 and substantially normal to intermediate flange 22. Formed into the free edge 23a are a plurality of substantially rectangular recesses or slot 24 of uniform depth except for upwardly extending hook-like projections 25 which form, with the inward edges of recesses 24, hook receiving slots 26. Slots 26 extend vertically, are preferably of uniform depth and have a width slightly greater than the thickness of the hook means to be described which fit therein.

In the engagement system contemplated, it is preferred that at least two recesses 24 be provided in the front flange 23 for each panel to engage. However, it is feasible to operate the system with but a single engagement with the Z-stringer for each panel engaged in the system. The width of outer flanges 23 from the inside edge of recesses 24 to rearwardly or forwardly extending intermediate flange 22 must be at least equal to the length of the free ends of the hook members to engage and disengage same as will be described. At the bottom end of the Z-stringer, there is preferably positioned an outwardly extending support flange 27 which is preferably of a length slightly less than the thickness of the panels to be engaged in the system (see FIG. 4) and of a width substantially that of flange 23. This flange serves to aid in the support of the lower edge of the lowermost horizontally extending panel as seen in FIG. 3.

Referring to FIGS. 8-10, inclusive, therein is shown a channel post which may be substituted for the Z-stringer whenever the post itself is desired to be employed as the entire vertical support of the sign system, rather than having an additional vertical support such as a wooden post, building wall or truck side wall, etc. to which the Z-bar stringer is attached. The channel post comprises a U-shaped member having a rearwardly extending flange 28 having forward flange 30 and rearward flange 29 formed integral therewith or connected thereto and extending normal thereto. Flange 28, as may be seen in FIG. 9 is preferably tapered asymmetrically from a greater width below to a lesser width above with rearwardly positioned flange 29 converging toward vertical front flange 30. Flange 25? is unfeatured and has a straight lateral edge 2% extending parallel to the face of flange 28. Flange 30, on the other hand, has a plurality of recesses 31 formed in the free edge 30a thereof of uniform depth save for the presence of upwardly-extending elongate hook members 32 which provide, in cooperation with the recesses 31, locking slots 33. This structure is analogous to the recesses 24, hook members 25 and slots 26 of the Z-bar stringers previously described. Buttons 34 are preferably provided to provide a snug flt between the engaging flanges 46 of the stilfeners, front flanges 30 of the channel posts and stiffener faces 41. A support clip may be employed in the manner of flange 27 to aid in supporting the lower panel. Connector flange 28a is attached to flange 28 by suitable bolts, screws or fasteners 28b. Horizontal panel receiving platform 280 has vertical panel 28d connecting same to flange 28a. Free edge 30a is parallel to the free edge 29a.

A plurality of horizontally mountable panels are pro vided, the panels being mountable on the Z-stringers or channel posts previously described. These horizontal panels are of a length greater than the distance between the Z-stringers or posts. The number of posts or Z-stringers employed in an installation depends largely upon the length of the panels employed in the total advertising sign structure. Except in the case of extremely long panel members or in the case of signs contemplating very high windload, a pair of posts or stringers is sufiicient. The number of horizontal panel members employed in an installation may be varied, but three is typical as shown in the drawings.

The construction of the individual horizontal panels is best seen in FIGS. 1, 2, 3, 4 and 7. Each of said panels preferably comprises a horizontally elongated front sheet 35 each having a pair of rearwardly-extending flanges 36 and 37 along the lower and upper opposite longitudinal edges thereof, respectively. Both of said flanges preferably have inturned lips 38 and 39 along the rearmost edges thereof. Preferably, the front sheets are continuous with the flanges, but, if desired, the flanges and a tab may be separately formed and stapled or otherwise attached to front panels of varied materials to meet varied sign adhesion problems. Each flange 36 and 37 preferably has at least one longitudinally extending concave or convex corrugation forming an outwardly extending or inwardly projecting rib at one edge of the panel. Complementary ribs or grooves must be formed at the opposing edge or flange of the adjacent panel (see FIGS. 3 and 7), the complementary rib and groove construction in a plurality of panels providing means for interlocking adjacent panels in a common plane when they are positioned side by side. The corresponding ribs and grooves are preferably formed midway between the panel face 35 and the rear inturned lips 38 and 39. It should be noted that the corrugations are relatively deep when compared with the width of the flanges 36 and 37, taking on the 'form of a U having parallel legs. By providing this type of construction, the interlocking of adjacent panels in a common plane is insured even though the panels may not, for some reason, closely abut one another. In other words, should the panels become slightly vertically separated, one from another, the panels will still remain locked together in a common plane by virtue of the deep corrugations and no play between the two in a direction normal to the faces thereof will be permitted.

If it is necessary or desirable that the flange 36 resting on flange 27 of the Z-stringer have the groove therein extending upwardly and also that the groove in the upper flange 37 (FIG. 7) extend downwardly for aid in positioning the molding or trim thereon, then it is evident that the grooving of the panels in the system must be different. Therefore, the grooves in the flanges of the lower panel have been numbered 4001, the mating grooves in the next above panel 4%, with the grooves in the uppermost panel designated 400.

Still referring to the sign panel members, a plurality of essentially vertically extending panel stiffeners are mounted on the rear of panel faces 35 of the horizontally extending panels, spaced to oppose the vertical mounting means. Means are provided on the panel stifleners which are removably and vertically engageable and disengageable with portions of the vertical mounting means (hooks 25) for removably mounting the panels on the vertical mounting means. The panel stiffeners, best seen in FIGS. 3, 4 and 5, preferably comprise formed metallic sheets essentially U-shaped in cross section, the closed face 41 of the U or bottom thereof being positioned opposed to and away from the panel sheet 35. The edges 42 of the U-shaped sheet are free and positioned next to the rear face of the panel sheet 35. Edges 42 are preferably outwardly turned as shown to form a base for the panel stiffeners. The stiffeners are preferably of a length, when positioned at right angles to flanges 38 and 3h to extend flange-to-flange or substantially so on the backs of panels and preferably of a thickness to just fit under inturned lips 38 and 39. Grooves 43 are cut into the edges of the face of the panel stiffeners to engage grooves a, etc. in flanges 36 and 37. Means are provided cooperatingbetween the inturned lips 38 and 39 and the outer faces 41 of the panel stiffeners to engage the latter with the lips 38 and 39 to hold the panel stiifeners fast against horizontal movement relative to the panel sheet 35 yet permit easy and convenient engagement and disengagement of the panel stiifeners with the horizontal panels 35. Such means may comprise mating grooves 44 and formed respectively in theinturned lips 38 and 39 and outer faces 41 of the panel stiffeners.

To insert the panel stiifeners under the inturned lips 38 and 39, the stitfeners, which have a height or thickness from the outwardly turned edges 42 thereof to the closed face 41 thereof essentially equal to the distance from the rear face of the panel sheet 35 to the underside of the lips 38 and 39, is engaged with one groove 44 in an inwardly turned lip 38 or 39. The opposite edge of the panel stiffener is then pivoted around this engagement point and, as the groove 45 in the top surface 41 of the panel stiffener approaches the groove 44 in the other inturned lip the groove 43 in the edge of the panel stiffener engages the flange trough or groove 40a, etc. and guides the panel stiffener into place, a sharp blow or quick pressure forcing the bottom of the groove 44 over the top face 41 of the panel stiffener into place.

Means are provided positioned relative to the rear closed faces 41 of said panel stiffeners removably engageable with the books 25 for removably mounting the panel stiffeners and, thus, the vertical panels on the vertical mounting means (Z-stringer or channel post). Such mounting means comprise laterally extending hook flanges 46 having angled free edges 46a fixed to or formed from the rear surface (as mounted on the horizontal panels) or closed face of the panel stilfeners. Flanges 46 are spaced outwardly from the rear face 41 of the stiffeners and the inturned lips 38 and 39 of the horizontal panel, said flanges 46 engageable with the upwardly extending teeth or hooks 25 or 32 of the stringers or posts. Free edges dda aid in the positioning of the flanges over the front flanges 23 of the Z-stringers. The distance between the main portion of the flange 46 and the outer surfaces of the inwardly turned lips 38 and 59 of the rear faces of the panel sheets 35 is preferably essentially equal to the thickness of the vertical mounting means in the engageable or engaged portions thereof. This relationship is best seen in FIGS. 3-6, inclusive.

The assembly of the panels on the mounting means, either the Z-bar stringers of the first seven figures, or the channel posts of FIGS. 8l0, inclusive, will be described before the molding structure per se and its application to the panel system.

In assembly and operation, it will be seen that an extremely simple construction has been provided, easy to assemble, yet very rugged after assembly and attractive in appearance with many desirable features.

Referring first to the form of FIGS. 17, inclusive, utilizing the Z-bar stringer, the stringers themselves are mounted on vertical wooden posts, a building outside wall, a truck wall, etc., whatever vertical surface desired, by screws or bolts inserted through the openings 21 in flange 20 thereof. Assuming a pair of Z-bar stringers are to be employed to mount the panels as seen in FIG. 2, they are spaced apart a predetermined distance whereby the hooks of the panel stiffeners will be able to engage the recesses 24 and slide into the openings 26 simultaneously.

It is assumed that the front panels themselves have been assembled With each panel having a pair of stiffeners engaged under the rear flanges 38 and 39 or otherwise fixedly attached to the rear side of the panel faces 35. These stiffeners extend normal to the length of the panels, which are to be horizontally oriented, therefore vertical. At least two hook members 46 are preferably attached to or formed from each panel stiffener.

The lower panel is mounted first by, looking at the view of FIG. 2, sliding the panel in horizontally from the left, with the hook members at a vertical elevation sufficient to ride over the vertical hook members 25 on flanges 23 and then, when the base portions'of the hook members 46 strike the bases of the recesses 24, the panel is permitted to slide downwardly whereby the lower rearwardly extending panel side flange 36 rests on the support flanges 27 and the lower edges of the lower hook members 46 engage the bases of the slots 26. In all this action, the inwardly turned panel flanges 38 and 39 slide on the front faces of stringer flanges'23.

It will be observed that lateral movement of the mounted panel cannot occur, as the hook members 46 are retained by recess walls 24 and engaging members 25, unless the panel is lifted. The panel cannot fall due to the hook member engagements and the additional flange rests 27.

A second panel is then slid in in the same manner, enough above the first engaged panel to permit the hook members thereof to fit down into the slots 26 after contacting the bases of recesses 24. In all cases the outwardly bent edges 46a aid the engagement of the hook members 46 with the front flanges 23. In FIG. 7, a typical interengagement of the contacting side flanges of adjacent horizontal panel members is seen with the grooverecess engagement 40a and 4490 aiding in the stabilization of the panels against inward and outward movement in addition to the hook member engagement.

When the upper or third panel member has been inserted and mounted in the same manner, the entire panel array presents from the front a uniform unbroken sign receiving expanse which is secured in engagement with the individual panel members thereof coupled to one another by the recess-groove arrangement as well as to the stringers. To remove the panels, one starts with the top panel, lifting first the length of the panel (typically, one man at each end edge) a sufficient distance to free the lower edges of hook members 46 from the slots 26, and then moving the panel member sutficiently to the left (in FIG. 2 view) to disengage the hooks 46 from the front flanges 23, whereby the panel may then be removedentirely. Following this, the next lower panel is removed in the same manner, and then the lowest. Lifting of each panel to disengage the hook members also disengages the between panel recess-groove engagement.

In mounting and dismounting the panels and panel members on and from the channel posts of FIGS. 8-10, the same sequence is observed, namely, the lowermost panel being first mounted and last removed. As may be seen in FIG. 4, the hook members 46 extend rearwardly of the panel rear inturned flanges and stiffener rear face. This distance is equal to the thickness of the members 32 whereby the inturned flange edges 38 and 39 of rear flanges 36 and 37 will lie against edges 29a and 30a in flush relationship whereby to be uniformly supported thereby. This is analogous to the flush abutment of flanges 33 and 39 against the front flange 23 of the Z-bar stringers.

Lateral motion of the panel members is also employed in engagement thereof with the channel posts of FIGS. 840, inclusive, the panels merely being moved toward the edge 30a at an elevated level whereby the upper edges of the hook members 46 just pass under the upper edges of the recesses 31 with which they are to be engaged, the panels then lowered whereby the lower edges of hook members 46 at their connection with the stilfeners slide into slots 33.

From the foregoing it will be seen that this invention is one well adapted to attain all of the ends and objects hereinabove set forth together with other advantages which are obvious and which are inherent to the structure.

It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claims.

As many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, I claim:

1. A sign construction comprising a plurality of essentially vertically oriented mounting means each laterally spaced one from the other, at least two first hook means on each said vertical mounting means vertically spaced from one another, said first hook means each open for engagement ina substantially vertical upward direction, a plurality of essentially horizontally oriented elongate panels removably mounted on said mounting means, means for removably mounting said panels on the first hook members of said vertical mounting means comprising at least two secondary hook members attached to the rear face of each panel, said secondary hook means each open for engagement in a substantially horizontal direction, said secondary hook members laterally spaced from one another on each said panel a distance at least substantially equal to the lateral spacing of two of said primary hooks on adjacent ones of said vertical mounting means and at least one of said first hook members on each adjacent vertical mounting means and one said secondary hook member on each said panel so spaced and formed as to be removably engageable one with the other.

2. A sign construction as in claim 1 including a plurality of sets of at least two secondary hook members on each panel adapted to engage a plurality of sets of at least two primary hook members on each vertical mounting means.

3. A sign construction comprising a plurality of essentially vertically oriented mounting means laterally spaced one from the other, a plurality of primary hook members on each mounting mean vertically spaced from one another, said primary hook members open for engagement in a substantially vertical upward direction, a plurality of essentially horizontally oriented elongate panels removably mounted on said vertical mounting means, each of said panels comprising an elongate sheet having a plurality of essentially vertically extending panel stitfeners mounted on the rear face thereof, said panel stiifeners comprising members extending a substantial part of the vertical distance between horizontal edges of said panels, means for removably mounting said panels on said vertical mounting means comprising at least two secondary hook members, at least one secondary hook member attached to each of two separate stifieners on the rear face of each panel and extending rearwardly thereof, said secondary hook members each open for engagement in a substantially horizontal direction, said secondary hook members and stiffeners carrying same laterally spaced from one another on each said panel a distance substantially equal to the lateral spacing of two of said primary hooks on adjacent ones of said vertical mounting means and said primary and secondary hook members so formed and spaced as to removably engage portions of said vertical mounting means.

4. A sign construction as in claim 3 including a plurality of vertically spaced secondary hook members mounted on each stiffener carrying same.

5. A sign construction as in claim 3 wherein said vertical support means and stiffeners on each panel carrying hook members are each two innumber and said hook carrying stiifeners are spaced over half the horizontal length of the panels apart.

6. A sign construction comprising a plurality of essentially vertically extending mounting means laterally spaced, one from the other, a plurality of primary hook members on each said mounting means vertically spaced from one another, said primary hook members open for engagement in a substantially vertical upward direction, a plurality of essentially horizontally oriented elongate panels removably mounted on said vertical mounting means, each of said panels comprising a sheet having a pair of rearwardly extending flanges along the opposite longitudinal edges thereof, a plurality of essentially vertically oriented panel stitl'eners mounted on the rear face of each of the vertical panels, said panel stiifeners comprising members extending substantially fiange to flange on the backs of said panels, means for removably mounting said panels on said vertical mounting means comprising at least two secondary hook members, at least one secondary hook member attached to each of two separate stiffeners on the rear face of each panel, and extending rearwardly of said stitfeners and flanges, said secondary hook members each open for engagement in a substantially horizontal direction, said secondary hook members and stiifeners carrying same laterally spaced from one another on said panel a distance substantially equal to the lateral spacing of two of said primary hooks on adjacent ones of said vertical mounting means, said primary hook members on said vertical mounting means and secondary hook members on said panels so formed and spaced as to be removably engageable one with the other.

7. A sign construction comprising a plurality of essentially vertical mounting means laterally spaced, one from the other, a plurality of primary hook members on each said mounting means vertically spaced from one another, said primary hook members open for engagement in a substantially vertical upward direction, a plurality of essentially horizontally oriented elongate panels removably mounted on said vertical mounting means, each of said panels comprising a horizontally elongated sheet having a pair of rearwardly extending flanges along the opposite longitudinal edges thereof, each of said flanges having an inturned lip along the rearmost edge thereof, a plurality of essentially vertically oriented panel stitfeners mounted on the rear face of each of said horizontal panels, said panel stifleners comprising members extending substantially flange to flange on the backs of said panels, fitting under the inturned lips and fixed relative thereto against horizontal motion, means for removably mounting said panels on said vertical mounting means comprising at least two secondary hook members, at least one secondary hook member attached to each of two panel stiileners on the rear face of each panel, and extending rearwardly of said flanges and stiifeners, said secondary hook members each open for engagement in a substantially horizontal direction, said secondary hook members and stiifeners carrying same spaced laterally from one another on said panels a distance substantially equal to the lateral spacing of the primary hooks on two adjacent ones of said vertical mounting means, and said hook members and vertical mounting means so formed and spaced as to be removably engageable, one with the other.

References Cited in the file of this patent UNITED STATES PATENTS 2,373,778 Quinby Apr. 17, 1945. 2,472,981 Miller June 14, 1949 2,492,937 Olmsted Dec. 27, 1949 2,662,743 Frenger Dec. 15, 1953 2,395,619 Frazier July 21, 1959 2,901,849 Callison Sept. 1, 1959 

1. A SIGN CONSTRUCTION COMPRISING A PLURALITY OF ESSENTIALLY VERTICALLY ORIENTED MOUNTING MEANS EACH LATERALLY SPACED ONE FROM THE OTHER, AT LEAST TWO FIRST HOOK MEANS ON EACH SAID VERTICAL MOUNTING MEANS VERTICALLY SPACED FROM ONE ANOTHER, SAID FIRST HOOK MEANS EACH OPEN FOR ENGAGEMENT IN A SUBSTANTIALLY VERTICAL UPWARD DIRECTION, A PLURALITY OF ESSENTIALLY HORIZONTALLY ORIENTED ELONGATE PANELS REMOVABLY MOUNTED ON SAID MOUNTING MEANS, MEANS FOR REMOVABLY MOUNTING SAID PANELS ON THE FIRST HOOK MEMBERS OF SAID VERTICAL MOUNTING MEANS COMPRISING AT LEAST TWO SECONDARY HOOK MEMBERS ATTACHED TO THE REAR FACE OF EACH PANEL, SAID SECONDARY HOOK MEANS EACH OPEN FOR ENGAGEMENT IN A SUBSTANTIALLY HORIZONTAL DIRECTION, SAID SECONDARY HOOK MEMBERS LATERALLY SPACED FROM ONE ANOTHER ON EACH SAID PANEL A DISTANCE AT LEAST SUBSTANTIALLY EQUAL TO THE LATERAL SPACING OF TWO OF SAID PRIMARY HOOKS ON ADJACENT ONES OF SAID VERTICAL MOUNTING MEANS AND AT LEAST ONE OF SAID FIRST HOOK MEMBERS ON EACH ADJACENT VERTICAL MOUNTING MEANS AND ONE SAID SECONDARY HOOK MEMBER ON EACH SAID PANEL SO SPACED AND FORMED AS TO BE REMOVABLY ENGAGEABLE ONE WITH THE OTHER. 